Header being cut off on Magazeen theme

On my blog peaktimesonline.co.uk, the header at the top is cut off. The code I have used is here:
#header {
margin:0; padding:0;
width:1000px; height:200px;
background: url(images/header.gif) no-repeat top right;
border-bottom:1px solid #4a4d4c;
}

The image size that I have uploaded in images/header.gif is exactly 1000px wide and 200px tall, and yet the header is still being cut off!
How can I correct this?
Thanks in advance to anyone that can help